The Duke and Duchess of Cambridge have applied for PG's first passport, reports suggest.

At just nine weeks old the little prince is already pretty well travelled with most of the UK under his belt. He's even made the big ol' slog to Balmoral Castle in Scotland to meet his great grandfather Prince Philip.

"We are all very hopeful of coming to Australia next year," Prince William told guests at the Anglesey show in Wales on back in August.

However, Queen Elizabeth will need to give special permission for Wills, K-Middy, and George to fly on the same flight, because "royal protocol dictates an heir and the next in line should not fly together," reports The Mirror.

According to the paper a spokesman for Kensington Palace, declined to comment on Prince George's passport, saying it was "a private document".